Replace a cracked or leaking tank with the Dorman coolant reservoir, part number 603-973, a pressurized reservoir that holds engine coolant for the cooling system and comes with its own cap. It fits many vehicles, among them the 2014-2018 Chevrolet Silverado 1500 4.3L / 5.3L / 6.2L, 2014-2018 GMC Sierra 1500 4.3L / 5.3L / 6.2L and 2014-2018 Chevrolet Silverado 2500 4.3L / 5.3L. See the "Vehicles it fits" section for the full list.
This Dorman OE Solutions plastic coolant reservoir is designed to replicate the original part and to fit and work like the factory unit. It is engineered for a seamless installation as a direct-fit replacement for the listed applications. It is built from quality materials meant to stand up to underhood heat and engine vibration, and Dorman backs it with 100 years of automotive aftermarket experience.
- Pressurized design: 1.5 L capacity, cataloged for the front position.
- Cap included: spring-loaded twist cap with a 15 psi maximum pressure rating.
- Mounting: two mounting holes. Mounting hardware, mounting brackets and a level sensor are not included.
- Material and color: plastic, in clear and black.
The package contains one coolant reservoir and one cap. Country of origin: Thailand. Cracks in the tank, coolant seeping around it, or a coolant level that keeps dropping are signs a reservoir may need replacing. Diagnose the source of the leak before replacing parts. Consult the vehicle service information for the correct fasteners and whether the originals may be reused.
Interchange: ?APET0239
APET0239 · 84368362 · 13502354 · 22856231 · 2411170 · GM3014133 · GM3014134 · SK603973
This part cross-references / interchanges with the following part numbers:
?APET0239, 84368362, 13502354, 22856231, 2411170, GM3014133, GM3014134, SK603973
Frequently Asked Questions
Is this the right Chevy Silverado 1500 coolant reservoir for a 2014-2018 model with the 4.3L, 5.3L or 6.2L engine?
It is listed for the 2014-2018 Chevrolet Silverado 1500 with the V6-4.3L, V8-5.3L and V8-6.2L engines. Check the "Vehicles it fits" section to confirm your vehicle.
What does a pressurized coolant tank do?
It holds engine coolant as part of the pressurized cooling system and is closed by a cap with a 15 psi maximum pressure rating. This reservoir has a 1.5 L capacity.
What comes with the Dorman engine coolant reservoir?
The package contains one coolant reservoir and one spring-loaded twist cap. Mounting hardware, mounting brackets and a level sensor are not included.
How does it install?
It is a direct-fit replacement for the listed applications and has two mounting holes. Follow the vehicle service information for the correct fasteners and the coolant refill procedure.
What are signs a coolant reservoir may need replacing?
Cracks, coolant seeping around the tank, or a coolant level that keeps dropping are signs it may need replacing. Hoses, the cap or other parts can cause the same signs, so diagnose the leak first.
